Bug 1171962 - introduce telemetry histogram that counts the amount of sessions that exchanged one or more chat messages. r=vladan,dmose. a=sylvestre

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trip."},"DEVTOOLS_DEBUGGER_RDP_LOCAL_PROTOTYPE_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'prototype' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_REMOTE_PROTOTYPE_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'prototype' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_REMOTE_DISPLAYSTRING_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'displayString' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_LOCAL_DISPLAYSTRING_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'displayString' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_LOCAL_SUBSTRING_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'substring' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_REMOTE_SUBSTRING_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'substring' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_LOCAL_RELEASE_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'release' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_REMOTE_RELEASE_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'release' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_LOCAL_LISTTABS_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'listTabs' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_REMOTE_LISTTABS_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'listTabs' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_LOCAL_PROTOCOLDESCRIPTION_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'protocolDescription' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_REMOTE_PROTOCOLDESCRIPTION_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'protocolDescription' request to go round 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trip."},"DEVTOOLS_DEBUGGER_RDP_LOCAL_DELETE_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'delete' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_REMOTE_DELETE_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'delete' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_LOCAL_THREADDETACH_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'detach' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_REMOTE_THREADDETACH_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'detach' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_LOCAL_ADDONDETACH_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'detach' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_REMOTE_ADDONDETACH_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'detach' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_LOCAL_TABDETACH_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'detach' request to go round trip."},"DEVTOOLS_DEBUGGER_RDP_REMOTE_TABDETACH_MS":{"expires_in_version":"never","kind":"exponential","high":"10000","n_buckets":"1000","description":"The time (in milliseconds) that it took a 'detach' request to go round 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